Re:Re: concurrent users

Discussion created by ca.portal.admin on Apr 14, 2008
Hi Wayne:

You're likely to get answers all over the board on this one, but perhaps
that is exactly what you want.

Other than some obvious restraints, like virtual memory,=20
network bandwidth, CPU cycles, etc., I have never heard of an=20
IDMS system that could not support the maximum concurrent=20
number of users (albeit I had a lot of fun during the Cullinet=20
years doing performance and tuning consulting to achieve=20
exactly that result ;-}} ).

That said, I suspect you may be asking about life in the 'new=20
world', with web services, etc.

I have personally simulated 10K users hitting an ASP page that=20
connected/retrieved minimum data from an IDMS database. I=20
don't have all of the details anymore, but the overall response=20
was about 1.17 seconds running the simulation for about 15=20
minutes. This was done on CA iron in
2003/2004 on a R14.1 CV.

Of course, it was just a simulation, but it illustrates that=20
you can push a rather large load through a CV if you have=20
enough back-end resources.
Again, just my 2cents...your results WILL vary...

Please feel free to contact me offline (

Tom Schoenborn
TA Schoenborn & Associates LLC

----- Original Message -----
From: ""Doneker, John W (US SSA)"" <John.Doneker@BAESYSTEMS.COM>
Sent: Monday, April 14, 2008 2:48 PM
Subject: concurrent users

Does anyone have an idea of the concurrent number of users IDMS=20
can handle?

J. Wayne Doneker

BAE Systems

York Pa.,

717 225 8109
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Re: concurrent users
"Right Bob, but that does not mean the repeat count limit is the pterm
limit for the sysgen. I think it's the limit for the pterm def for that
line. You can define multiple lines, and the max repeat count for each
pterm. So, 2 VTAM lines with 32k Pterms max, results in 64k pterms for
the sysgen. I dont know how many lines can be coded, but if it's VTAM,
then it's definitely more then one line.

Lutz Petzold
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